File: /usr/src/linux/net/ipv4/utils.c
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Various kernel-resident INET utility functions; mainly
7 * for format conversion and debugging output.
8 *
9 * Version: $Id: utils.c,v 1.8 2000/10/03 07:29:01 anton Exp $
10 *
11 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 * Fixes:
14 * Alan Cox : verify_area check.
15 * Alan Cox : removed old debugging.
16 * Andi Kleen : add net_ratelimit()
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #include <asm/uaccess.h>
25 #include <asm/system.h>
26 #include <linux/types.h>
27 #include <linux/kernel.h>
28 #include <linux/sched.h>
29 #include <linux/string.h>
30 #include <linux/mm.h>
31 #include <linux/socket.h>
32 #include <linux/in.h>
33 #include <linux/errno.h>
34 #include <linux/stat.h>
35 #include <stdarg.h>
36 #include <linux/inet.h>
37 #include <linux/netdevice.h>
38 #include <linux/etherdevice.h>
39 #include <net/ip.h>
40 #include <net/protocol.h>
41 #include <net/tcp.h>
42 #include <linux/skbuff.h>
43
44
45 /*
46 * Display an IP address in readable format.
47 */
48
49 char *in_ntoa(__u32 in)
50 {
51 static char buff[18];
52 char *p;
53
54 p = (char *) ∈
55 sprintf(buff, "%d.%d.%d.%d",
56 (p[0] & 255), (p[1] & 255), (p[2] & 255), (p[3] & 255));
57 return(buff);
58 }
59
60 /*
61 * Convert an ASCII string to binary IP.
62 */
63
64 __u32 in_aton(const char *str)
65 {
66 unsigned long l;
67 unsigned int val;
68 int i;
69
70 l = 0;
71 for (i = 0; i < 4; i++)
72 {
73 l <<= 8;
74 if (*str != '\0')
75 {
76 val = 0;
77 while (*str != '\0' && *str != '.')
78 {
79 val *= 10;
80 val += *str - '0';
81 str++;
82 }
83 l |= val;
84 if (*str != '\0')
85 str++;
86 }
87 }
88 return(htonl(l));
89 }
90
91